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@mvp2885 wrote:

They might be willing to pay the SE taxes. 

LOL.  "might be willing"?  As if paying taxes is optional?

They started a corporation, they need to do it right.  Prepare the W-2s and payroll.  It is not a choice.  If they want you to prepare the forms, warn them about penalties and get paid upfront.

You may want to assess if a corporation is right for the client or not.  Based on what they are doing, as Jeff said, a Schedule C may be better.